Thanks A E Neuman.
Today I made templates of the Moss Motor rocker panels. Compared them for fit against a newly restored "A" and they seem quite close. However, since I've not done this before, (and do not want to do it twice) my plan is to take the advise of those with more experience and send my Moss parts to Crateparts for their modification.
Thanks again, will report with the results.
Mick G